﻿#region Copyright
// Copyright (c) 2011-2012 RaisingForce Team (Alikin Sergey)
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Diagnostics.Contracts;
using RaisingForce.Raise.ObjectModel;

namespace RaisingForce.Raise.Measures
{
    [Serializable]
    internal struct DoubleMeasureValue<TMeasure>
        where TMeasure : class, IMeasure<double>
    {
        #region Constructors

        public DoubleMeasureValue(
            double innerValue,
            TMeasure innerMeasure)
        {
            this.innerValue = innerValue;
            this.innerMeasure = innerMeasure;
        }

        #endregion

        #region Private Declarations

        private readonly double innerValue;

        [NonSerialized]
        private readonly TMeasure innerMeasure;

        #endregion

        #region Properties

        public double InnerValue
        {
            get { return this.innerValue; }
        }

        public TMeasure InnerMeasure
        {
            get
            {
                Contract.Ensures(Contract.Result<TMeasure>() != null);
                Contract.Assume(this.innerMeasure != null);
                return this.innerMeasure;
            }
        }

        #endregion

        #region Public Methods

        [Pure]
        public double GetInvariantValue()
        {
            Contract.Requires(!this.IsDefault());
            return this.innerMeasure.ToInvariant(this.innerValue);
        }

        [Pure]
        public bool IsDefault()
        {
            DoubleMeasureValue<TMeasure> defaultValue =
                default(DoubleMeasureValue<TMeasure>);
            return this.innerValue == defaultValue.innerValue
                && object.ReferenceEquals(this.innerMeasure, defaultValue.innerMeasure);
        }

        #endregion
    }
}
